Jon, your are not alone, I also worked outside the all summer, but like mentioned Timbeal, I receive my timber dried down to 17-20% from the sawmill, which I guess helped for less twisting, skrinking and crowning, but it still changed a little because of rain, sun and northern wind alternating fast here.
I will drill only the day I assemble the bent for good. are they special recommendations when using strps and come along then?, when i preassemble, it's super tight with 2tons straps and come along all around the bents...